HDPE vs LDPE Screw design - Plastic processing forums for extrusion information and advice and for other feed screw applications.

HDPE vs LDPE Screw design

Author	Topic: HDPE vs LDPE Screw design
mr_z Member Posts: 4 From: Registered: Oct 2004	posted October 18, 2004 05:33 AM Dear Forum Members, Simple question for experienced, but rather confusing details for myself. What is the basic design difference between HDPE and LDPE extruder screws.? Is there applications where, the same screw is used for both HDPE and LDPE extrusion.? Tx for commts IP: Logged
Tom C Moderator Posts: 384 From:Brodheadsville, PA USA Registered: Jun 2001	posted October 18, 2004 01:33 PM Same screw should work for both when MFR is similar. LDPE will have a lower rate becasue of the density difference. LDPE will also use slightly less power and have slightly lower melt temperature. Picking up the RPMs 10% on LDPE should give similar output to HDPE, and will produce also similar power consumption and temperatures. Significant MFR differences may require different screws. A lot depends on the process and melt quality requirments. LLDPE, UHMWPE and some other PEs have much different processing characterisitics and would require different screws. Tom C Extrusion Technical Services www.ExtrusionTech.com IP: Logged
mr_z Member Posts: 4 From: Registered: Oct 2004	posted October 19, 2004 07:55 AM Tom, thank you for your wise reply. I will work on it to complete my study. Since recently involved with extrusion world, as an engineer I do need your expertice to steer me on the right direction. IP: Logged

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